Perhaps you should try some spelling variations:
petru » pentru (Expand Search), peteru (Expand Search), petrou (Expand Search), peru (Expand Search)
petruo » pentruo (Expand Search), petro (Expand Search), peteruo (Expand Search), petrouo (Expand Search), peruo (Expand Search)
peteruv » peterv (Expand Search), petersv (Expand Search)
peteru » peter (Expand Search), peters (Expand Search)
peteruo » petero (Expand Search), peterso (Expand Search)
petriiv » peteriiv (Expand Search), petroiiv (Expand Search), periiv (Expand Search)
petr » peter (Expand Search), petro (Expand Search), per (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search), peri (Expand Search)

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: fop ((petriiv OR peteruv) OR (((petru OR peteru) OR (petruo OR peteruo)) OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriiv OR peteruv) OR (((petru OR peteru) OR (petruo OR peteruo)) OR (petr OR petri))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriiv OR peteruv) OR (((petru OR peteru) OR (petruo OR peteruo)) OR (petr OR petri))) o.s.*.